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COMBINATORICS
2002
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2002
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COMBINATORICS
2002
15 years 5 months ago
2002
A sink-free orientation of a finite undirected graph is a choice of orientation
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COMBINATORICS
2002
15 years 5 months ago
2002
Erdos and Szekeres showed that any permutation of length n k2 + 1 contains
COMBINATORICS
1999
15 years 5 months ago
1999
We say that an antichain A in the boolean lattice Bn is flat if there exists
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COMBINATORICS
1999
15 years 5 months ago
1999
We study the 2-adic behavior of the number of domino tilings of a 2n